package encrypt;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class MD5Util {
	public static String getMD5Str(String str) {
		MessageDigest messageDigest = null;
		try {
			messageDigest = MessageDigest.getInstance("MD5");
			messageDigest.reset();
			messageDigest.update(str.getBytes("UTF-8"));
		} catch (NoSuchAlgorithmException e) {
			System.out.println("NoSuchAlgorithmException caught!");
			System.exit(-1);
		} catch (UnsupportedEncodingException e) {
			e.printStackTrace();
		}
		byte[] byteArray = messageDigest.digest();
		StringBuffer md5StrBuff = new StringBuffer();
		for (int i = 0; i < byteArray.length; i++) {
			if (Integer.toHexString(0xFF & byteArray[i]).length() == 1)
				md5StrBuff.append("0").append(
						Integer.toHexString(0xFF & byteArray[i]));
			else
				md5StrBuff.append(Integer.toHexString(0xFF & byteArray[i]));
		}
		return md5StrBuff.toString();
	}

	public static String encrypt(String strSrc) throws Exception {
		char[] hexDigits = { '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
				'A', 'B', 'C', 'D', 'E', 'F' };
		MessageDigest mdTemp = MessageDigest.getInstance("MD5");
		mdTemp.update(strSrc.getBytes());
		byte[] bMd = mdTemp.digest();
		int iLen = bMd.length;
		char[] cTmp = new char[iLen * 2];
		int k = 0;
		for (int i = 0; i < iLen; i++) {
			byte byte0 = bMd[i];
			cTmp[k++] = hexDigits[byte0 >>> 4 & 0xf];
			cTmp[k++] = hexDigits[byte0 & 0xf];
		}
		return new String(cTmp);
	}
}
